by Lobe, T.E., Wiener, E., Andrassy, R.J., Bagwell, C.E., Hays, D., Crist, W.M., Webber, B., Breneman, J.C., Reed, M.M., Tefft, M.C., Heyn, R.
Published in Journal of pediatric surgery (01.08.1996)

by Reed M.M, Wolfe J
Published in Extension review United States Department of Agriculture, Science and Education Administration (1982)